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We have a huge commercial tank that was used for mixing chemicals to spray lawns....we don't use it anymore for that and it's just sitting out for years in the backyard.

How can we clean it out so it can be used to store water?
 

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Whether you sprayed fertilizer or weed killer they are both toxic to humans. That means potable water storage in the tank is out of the question.

However, you can store water to irrigate crops or flush toilets or even to wash dishes in it as long as you rinse the dishes in clean water. (which then becomes water to flush the toilets)
 
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For starters, I'd never use it for consumption - ever.

But nothing degrades chemicals like bleach, sunlight, and time. I think with enough work you may be able to get it to the point you could make a grey-water tank out of it. Question is - what does a new tank cost and is it worth the effort?
 
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I'd go along with keeping it for gray water/un-purified rain water storage to be used to water your garden
 

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I have worked for a lawn care company right after I got back from the dessert... I can tell you now that with the chemicals we used, you could rinse that thing out with bleach over 1000 times and it will still get you sick.. the chemicals made to kill the weeds and or to use as fertilizer is strong enough to hold a presence even after rinsing and years of sitting... The end result is you should never ever use it for consumption.
 
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